揭秘碳化：从2A到5A

本项目通过将传统化学分析等方法与X射线CT等现代仪器测定法相结合，全面深入研究碳化水泥基材料的pH值、CaCO3含量、Ca(OH)2含量等碳化关键技术指标的演变规律，特别是对容易被忽略的部分碳化区特性进行开创性研究，把传统酚酞指示剂法仅辨明二个碳化分区的研究提升到了可辨识多达五个碳化分区的研究，即2A升级到5A。通过对比研究，构建起碳化相关各要素之间的关联性，建立以碳化程度为核心的碳化评价指标体系，从而解决了现有碳化深度指标不能识别部分碳化区及其带来的一系列科学认识与工程应用问题。通过碳化活化机理研究，建立基于碳化养护的矿渣、钢渣等固体废弃物资源化利用新途径。研究结果对深入认识水泥基材料在碳化作用下的物质组成、性能和微观结构演变规律有重要推动作用，并为碳化养护奠定更加坚实的理论基础，大大提高了水泥基材料碳失汇计算的准确性。

This applying program combines united methods including traditional methods such as chemical analysis, and modern instrumental analysis such as X ray computed tomography to carry out comprehensive and intensive study on developing characteristics of the key technical parameters of cement based materials carbonation, such as pH value, content of calcium carbonate, content of calcium hydroxide etc., particularly the pioneering study on partially carbonated area characteristics which is commonly neglected. This investigation promotes the study of phenolphthalein indicator method which can only distinguish two carbonation areas to the applying study with the capacity of identifying five carbonation areas, that means 2A will be upgraded to 5A. By comparison study, the relationship between the essential factors related with carbonation is established, the evaluation index system of carbonation centered by carbonation degree is developed, as a result, the current problem that the present carbonation depth index cannot distinguish partially carbonated area as well as the resulting series of problems on scientific understanding and engineering applications are solved. By studying the activation mechanism of carbonation, a novel approach of resource-like utilization of solid waste such as furnace slag and steel slag is developed based on the carbonation curing. The research results can provide driving forces to better understand the developing characteristics of chemical component, properties and microstructures of cement based materials under carbonation, can provide stronger theoretical basis for carbonation curing, and can greatly increase the accuracy of computing the missing carbon sink of cement based materials.